A php7.3 security update has been released for Debian GNU/Linux 10 to address multiple security issues which could result in denial of service, information disclosure, cookie forgery or incorrect encryption.

DSA 4856-1: php7.3 security update

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Debian Security Advisory DSA-4856-1 security@debian.org
  https://www.debian.org/security/ Moritz Muehlenhoff
February 17, 2021   https://www.debian.org/security/faq
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Package : php7.3
CVE ID : CVE-2020-7068 CVE-2020-7069 CVE-2020-7070 CVE-2020-7071
CVE-2021-21702

Multiple security issues were found in PHP, a widely-used open source
general purpose scripting language which could result in denial of
service, information disclosure, cookie forgery or incorrect encryption.

For the stable distribution (buster), these problems have been fixed in
version 7.3.27-1~deb10u1.

We recommend that you upgrade your php7.3 packages.

For the detailed security status of php7.3 please refer to
its security tracker page at:
  https://security-tracker.debian.org/tracker/php7.3

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at:   https://www.debian.org/security/